罗子沟盆地有机质热演化对砂岩物性的改造作用

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Effect of Organic Thermal Evolution on Physical Characteristics of Sandstone in Luozigou Basin

Liu Rong^1,2,3,Yang Xiaohong¹,Dong Qingshui^1,2,3,Liu Dongqing¹,Lin Bin¹, Xu Yinbo¹,Zhang Chao¹

1.College of Earth Sciences, Jilin University, Changchun130061, China;
2.Key-Lab for Evolution of Past Life and Environment in Northeast Asia,Ministry of Education,Changchun130026,China;
3.Key-Lab for Oil Shale and Symbiosis Energy Minerals, Jilin Province, Changchun130026, China

Received:2013-08-19 Online:2014-03-26 Published:2014-03-26

Abstract

Abstract:

Physical characteristics of sandstone in Luozigou basin were studied qualitatively and quantitatively with thin sections, mercury intrusion, SEM, X-ray diffractions and some other methods. Results show that the main lithological types of Dalazi Formation are lithic arkose and arkose with low compositional maturity and low textural maturity. The physical characteristics of sandstone were characterized by high porosity ( 16.2% to 26.4%) and very low permeability(0.13×10^-3μm² to

1.68×10^-3μm²), and the porosity type was mainly secondary pores which accounst for 88% of the whole porosity. Result of organic element analysis，chromatography，maceral microscopy and rock pyrolysis showed that large amounts of organic acids generated during the thermal evolution of mudstone and shale in Luozigou basin and dissolute feldspar in sandstone, which lead to high secondary porosity. While, at the same time, associated products of the dissolution blocked the throat to some extent. These two processes make the sandstones show high porosity and low permeability.

Key words: physical characteristics of sandstone, organic thermal evolution, organic acids, secondary porosity, Luozigou basin

CLC Number:

P618.3

Liu Rong,Yang Xiaohong,Dong Qingshui,Liu Dongqing,Lin Bin, Xu Yinbo,Zhang Chao. Effect of Organic Thermal Evolution on Physical Characteristics of Sandstone in Luozigou Basin[J].Journal of Jilin University(Earth Science Edition), 2014, 44(2): 460-468.

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Effect of Organic Thermal Evolution on Physical Characteristics of Sandstone in Luozigou Basin

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